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Amidon Type 2 Cores

In theory Amidon type 2 iron-dust toroids have a red and plain coating. Looking at those for sale, on Ebay for example, they are now brown and plain, I have bought one or two and can't tell if they are genuine or if there's been a change by the manufacturer. Does any Islander know or can confirm there has been a change?

Having several of them bought over the years, from 200 to 400 size, i can confirm the colour became much more dark, almost red/brownish.
Put a few windings on an older one and newer one and see how much micro Henry they make and see for yourself.

"If the Republicans will stop telling lies about the Democrats, we will stop
telling the truth about them." - Adlai Stevenson (1900-1965)
“I’m not liberal/conservative, I’m anti-idiotarian.”
At some point in the last 20 years, the left moved to the center, and the right moved into a mental institution

Excellent idea, I'm reminded of core grading on my last job where reading low inductance values with a Boonton 1MHz L bridge inductance of the wire itself became an issue. I used a 3" length of 16ga straight bus wire between the terminals without a problem. Now the question is where to find laboratory equipment on the cheap?

"New Jersey, the most American of all states. It has everything from wilderness to the Mafia. All the great things and all the worst, like Route 22."
Jean Shepherd K2ORS (SK) & WOR radio personality

Engaging a troll is like playing chess with a pigeon. The bird will just knock over the pieces, shit on the board, and fly away to declare victory to his friends.

Can't help with the laboratory equipment, though measuring equipment became a lot cheaper over the years here, more on offer 2nd hand, less interested party's to buy it i guess, one benefit our dying out hobby has it seems.

"If the Republicans will stop telling lies about the Democrats, we will stop
telling the truth about them." - Adlai Stevenson (1900-1965)
“I’m not liberal/conservative, I’m anti-idiotarian.”
At some point in the last 20 years, the left moved to the center, and the right moved into a mental institution

"If the Republicans will stop telling lies about the Democrats, we will stop
telling the truth about them." - Adlai Stevenson (1900-1965)
“I’m not liberal/conservative, I’m anti-idiotarian.”
At some point in the last 20 years, the left moved to the center, and the right moved into a mental institution

I have a spare Tek 7603 with 2 7A26 vertical amplifiers and a 7B53A timebase that I'm going to list soon. Get a 7L12, 13 or 14 and turn it into a 2GHz spectrum analyzer - and there's a lot of other plugins besides. As configured it's a 4ch, 100MHz delayed triggering scope.

But it's largish and can't be remotely controlled or programmed, so the average experimenter will simply pass the thing by.

"Everyone wants to be an AM Gangsta until it's time to start doing AM Gangsta shit."